<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			section{
				display: flex;
				width: 60%;
				height: 150px;
				background-color: red;
				margin:0 auto;
			}
			section div:nth-child(1){
				width: 100px;
				height:150px;
				background-color: blue;
			}
			section div:nth-child(2){
				/* flex:none; */
				flex:auto;
				background-color:yellow;
				/* align-self: flex-end */
			}
			section div:nth-child(3){
				width: 100px;
				height:150px;
				background-color: green;
			}
		</style>
	</head>
	<body>
		<section>
			<div>1</div>
			<div>2</div>
			<div>3</div>
		</section>
	</body>
</html>